![]() ![]() ![]() Powered by django-wiki, an open source application under the GPLv3 license. Gram staining is a technique that uses violet dye to distinguish between gram-positive and gram-negative bacteria. Gram-negative bacteria stain red when this process is used. The cell walls of gram-negative bacteria contain only a thin layer of peptidoglycan, but they also have an outer membrane that is absent in gram-positive bacteria. Gram-negative bacteria are classified by the color they turn after a chemical process called Gram staining is used on them. are commonly found in various salt water environments. Bacteria are classified by how they appear under the microscope and by other features. Being highly salt tolerant and unable to survive in fresh water, Vibrio spp. This article was last modified: March 8, 2023, 10:20 a.m. Vibrio is a genus of Gram-negative bacteria, possessing a curved-rod (comma) shape, 1 2 3 4 several species of which can cause foodborne infection, usually associated with eating undercooked seafood. It contains Porin proteinsthat form pores for hydrophilic molecule diffusion and Lipopolysaccharideswith a negative charge that helps maintain bacteria's shape, but also potentially causes toxic shock in infected hosts. The outer membrane shields bacteria and hinders some antibiotics. The Periplasmic space: lies between the outer and cytoplasmic membranes, containing a gel-like matrix with vital proteins for cell functions. Peptidoglycan: in Gram-negative cell walls is a thin mesh of repeating subunits containing sugars and amino acids. Pleomorphism (microbiology) In microbiology, pleomorphism (from Ancient Greek -, pl, 'more', and -, morph, form), also pleiomorphism, is the ability of some microorganisms to alter their morphology, biological functions or reproductive modes in response to environmental conditions. LipopolysaccharideĬytoplasmic membrane: surrounds bacteria's cytoplasm, controls molecular movement, and is composed of proteins and lipids, similar to mammalian cells. An outer membrane containing lipopolysaccharides and porin proteinsįigure 1. A thin peptidoglycan layer, located in the periplasmic spaceģ. ![]() The Gram-negative bacterial cell wall consists of three primary layers.Ģ. ![]()
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